Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b510f44ac6587de…

MALICIOUS

PDF

71.4 KB Created: 2021-03-27 18:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 43978d8b6433dcc61c645fd6d3eaa74c SHA-1: 1bc341010e1761bc1f8830d697642bfdd36f8526 SHA-256: 8b510f44ac6587dee67623826078dd60ef23ad0d7f0b6981e768333ebda351c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=tv+addiction+2+ielts+reading+answers PDF link annotation
    • https://cdn.sqhk.co/kifukuvitog/9jcjixD/bts_fake_love_song.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/DBjgrha/jugojirufaridurowuresikef.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/5DOL8he/21521978867.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/bnjhxBA/car_driving_simulator_multiplayer_mod_apk.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/mokebumajurig.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/vimudopumezaxupopik.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/water_cycle_worksheet_middle_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_1955465d68cf4cc9955e45ef4de049c7.pdf?index=trueIn PDF document text
    • http://lefumes.rf.gd/loctite_243_safety_data_sheet_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cea162-f62e-464b-acdb-755392a707d7/samsung_ice_master_not_working.pdfIn PDF document text
    • http://nemunuj.rf.gd/71863112025.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_59883c084d934381ab478e0bcbc4ac1e.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_3dcf251ec1bf48e185a816c49af122f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/406f5e9c-55bb-43b9-9059-0c30a2eca9ac/nada_carmen_laforet_chapter_summary.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_7c65c4d83ff54ed09668d263829a128b.pdf?index=trueIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_7ab520a36fd8491990332546220a04ba.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 5340 bytes
SHA-256: 39875b1edc7831b0c28ad102f8ebf226b42d1f124097de8e50b948551970b9ca
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10720 bytes
SHA-256: 50f2afe955d7c239667f87e918ea84ec5a0696a727ec5e88af9bdd6600b16a9b

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